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1、BRITISH STANDARD BS ISO 1922:2001 Incorporating Amendment No. 1 Rigid cellular plastics Determination of shear strength ICS 83.100 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licensed Copy: London South Bank University, London South Bank University, Tue Jan 30 01:36:11 GMT
2、+00:00 2007, Uncontrolled Copy, (c) BSI BS ISO 1922:2001 This British Standard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 September 2001 BSI 11 December 2001 I
3、SBN 0 580 37929 9 National foreword This British Standard reproduces verbatim ISO 1922:2001 and implements it as the UK national standard. It partially supersedes BS 4370-2 Methods of test for rigid cellular materials Part 2: Methods 6 to 10:1993 which will be amended. The UK participation in its pr
4、eparation was entrusted to Technical Committee PRI/24, Flexible cellular materials and test methods, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement internationa
5、l or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all
6、 the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European com
7、mittee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii
8、to iv, pages 1 to 6, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments 1358511 December 2001Supersession details corrected Licensed Copy: London South Bank Un
9、iversity, London South Bank University, Tue Jan 30 01:36:11 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Reference number ISO 1922:2001(E) INTERNATIONAL STANDARD ISO 1922 Third edition 2001-07-15 Rigid cellular plastics Determination of shear strength Plastiques alvolaires rigides Dtermination de la r
10、sistance au cisaillement Licensed Copy: London South Bank University, London South Bank University, Tue Jan 30 01:36:11 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ii Licensed Copy: London South Bank University, London South Bank University, Tue Jan 30 01:36:11 GMT+00:00 2007, Uncontrolled Copy, (c)
11、BSI ISO 1922:2001(E) iii ContentsPage Foreword.iv 1Scope 1 2Normative references1 3Principle1 4Apparatus.1 5Test specimens3 6Number of test specimens3 7Conditioning and test temperature3 8Procedure.3 9Calculation and expression of results.4 10Precision and bias.4 11Test report5 Annex A (normative) C
12、hoice of adhesives for preparation of test specimens.6 Licensed Copy: London South Bank University, London South Bank University, Tue Jan 30 01:36:11 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ISO 1922:2001(E) iv Foreword ISO (the International Organization for Standardization) is a worldwide federa
13、tion of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committ
14、ee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance
15、 with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is dra
16、wn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 1922 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee S
17、C 10, Cellular plastics. This third edition cancels and replaces the second edition (ISO 1922:1981), which has been technically revised. Annex A forms a normative part of this International Standard. Licensed Copy: London South Bank University, London South Bank University, Tue Jan 30 01:36:11 GMT+0
18、0:00 2007, Uncontrolled Copy, (c) BSI INTERNATIONAL STANDARDISO 1922:2001(E) 1 Rigid cellular plastics Determination of shear strength 1Scope This International Standard specifies a method of determining the shear strength of rigid cellular plastics. It also provides for the optional determination o
19、f shear modulus. 2Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, p
20、arties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC ma
21、intain registers of currently valid International Standards. ISO 291:1997, Plastics Standard atmospheres for conditioning and testing. ISO 1923:1981, Cellular plastics and rubbers Determination of linear dimensions. 3Principle A shear stress is applied to a test specimen of defined shape by means of
22、 metal supports bonded to the specimen. 4Apparatus 4.1Test machine The test machine (see Figure 1) shall be such that: a)a test specimen having the form and dimensions specified in clause 5 is held vertically between two fixing devices each comprising a metal support, one of these devices being fixe
23、d and the other movable, and the stress being transmitted along the longitudinal axis of the specimen; b)the movable grip will be moved away from the fixed grip at a constant rate of (1?0,5) mm per minute in a direction parallel to the longitudinal axis of the specimen; c)the force exerted on the sp
24、ecimen shall be known with a maximum error of 1 %, and the distance between the grips shall be known with a maximum error of 0,01 mm, by means of recording devices. 4.2Metal supports These shall consist of flat, rectangular-sectioned, mild-steel plates, machined on one side, with a thickness of (16?
25、1) mm and a width of 1 0 50?mm. They shall be attached to the grips by the method shown in Figure 1. Licensed Copy: London South Bank University, London South Bank University, Tue Jan 30 01:36:11 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ISO 1922:2001(E) 2 Dimensions in millimetres Key 1Fixed machi
26、ne grip 2Universal-joint connection pins, allowing rotation about axis 3Tongue and groove 4Nut and bolt supports, ? 10 mm 5Adaptor 6Metal supports 7Test specimen 8Load-spreading plates measuring (50 ? 50 ? 5) mm 9Tongue and groove 10 Adaptor 11 Universal-joint connection pins, allowing rotation abou
27、t axis 12 Movable machine grip Figure 1 Test assembly Licensed Copy: London South Bank University, London South Bank University, Tue Jan 30 01:36:11 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ISO 1922:2001(E) 3 The thickness of the adaptors that connect the metal supports to the test machine grips s
28、hall be equal to the thickness of the test specimen. 4.3Adhesive The adhesive used to fix the metal supports to the test specimen shall be such that the shear strength and modulus of the adhesive film are significantly greater than that of the cellular material under test, so as to ensure ultimate f
29、ailure in the cellular material rather than at the adhesive interface. The adhesive shall also be compatible with the material under test. Details of a suitable adhesive and the method of application are given in annex A. 5Test specimens 5.1The test specimens shall be right parallelepipeds of the fo
30、llowing dimensions: a)length: 250 0 5? mm; b)width: 50 0 1? mm; c)thickness: (25?0,5) mm. The distance between two parallel surfaces shall not vary by more than 1 %. Measure the dimensions in accordance with the principles specified in ISO 1923. 5.2Prepare test specimens without moulding skins. Mach
31、ine their surfaces without modifying the original structure. Bond the two machined surfaces of the metal supports to the larger surfaces of the dust-free test specimens so that the edges of the two metal supports are parallel to each other, as shown in Figure 1. 6Number of test specimens Test a set
32、of five specimens. When testing materials suspected of being anisotropic, prepare sets of specimens having their major axes parallel with and normal to the suspected directions of anisotropy. Reject specimens that fail at the adhesive interface before failure of the cellular material and test additi
33、onal specimens so that the number of significant results is not less than five. 7Conditioning and test temperature Condition specimens immediately before testing for a period of not less than 16 h at a temperature of (23?2) C and at (50?5) % relative humidity, in accordance with ISO 291. Conduct the
34、 test at a temperature of (23?2) C. 8Procedure Attach a test specimen to the grips of the test machine and apply a force by separating the movable grip from the fixed grip at a rate of (1?0,5) mm per minute, with a variation not greater than 10 % during the test. Record the force-deflection diagram.
35、 Licensed Copy: London South Bank University, London South Bank University, Tue Jan 30 01:36:11 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ISO 1922:2001(E) 4 Repeat the test on the remaining specimens. NOTEThe following procedure is suggested to correct for the force imposed on the specimen by the m
36、etal supports and their attachments: Before attaching the test assembly to the machine attachments, adjust the test machine to zero force. If the force-measuring device is in the upper position, correct for the force exerted by one metal support and its attachments by determining their weight and su
37、btracting it from the recorded force. If the force-measuring device is in the lower position, correct for the force imposed by one metal support and its attachments by determining their weight and and adding it to the recorded force. 9Calculation and expression of results 9.1Shear strength The shear
38、 strengthqof the specimen, expressed in kilopascals, is given by the equation m 1000F q lb ? ? ? where lis the initial length, in millimetres, of the specimen; bis the initial width, in millimetres, of the specimen; Fmis the maximum force, in newtons, applied to the specimen. 9.2Shear modulus If des
39、ired, calculate the shear modulusGof the specimen, in kilopascals, using the equation 1000 G lb ? ? ? where ?is the thickness, in millimetres, of the specimen; ?is the slope of the linear portion of the force-deflection diagram, expressed in newtons per millimetre; lis the initial length, in millime
40、tres, of the specimen; bis the initial width, in millimetres, of the specimen. 10 Precision and bias The precision of this method is unknown, and data obtained by the method shall not be used in resolving disputes between suppliers and users. Licensed Copy: London South Bank University, London South
41、 Bank University, Tue Jan 30 01:36:11 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ISO 1922:2001(E) 5 11 Test report The test report shall include the following particulars: a)a reference to this International Standard; b)all details necessary for complete identification of the material tested; c)wher
42、e applicable, the direction of application of the force with respect to any anisotropy; d)the individual shear strength test results and the average shear strength for each direction of test; e)if calculated, the individual shear modulus values and the average shear modulus values for each direction
43、 of test; f)the mode of failure; g)any deviation from the method specified, any operational details not specified in this International Standard, and any circumstances liable to have had an influence upon the results; h)the date of testing. Licensed Copy: London South Bank University, London South B
44、ank University, Tue Jan 30 01:36:11 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ISO 1922:2001(E) 6 Annex A (normative) Choice of adhesives for preparation of test specimens Experience has indicated that the uniformity of application of the adhesive layer, and to a lesser extent the amount of adhesive
45、 used, are critical. Sufficient time for the adhesive to cure shall be allowed, the test specimens being undisturbed during that period. The curing period may constitute part or the whole of the conditioning period. It has been found that satisfactory results for most materials can be obtained using
46、 an epoxy-based adhesive applied to a uniform thickness. It has been found that satisfactory results for some materials can be obtained by: a)using a low-viscosity unsaturated-polyester adhesive, which may be applied by means of a small brush (for example a 25 mm paint brush); b)coating the surfaces
47、 to be bonded with the adhesive (the use of 5 g of adhesive for each surface is suggested); c)ensuring that the adhesive is applied within 15 min of mixing at (23?2) C; d)allowing at least 16 h for the adhesive to cure. Licensed Copy: London South Bank University, London South Bank University, Tue J
48、an 30 01:36:11 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Licensed Copy: London South Bank University, London South Bank University, Tue Jan 30 01:36:11 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS ISO 1922:2001 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the i
49、ndependent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the
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